CN214746788U - Energy-saving circulating system of freeze dryer - Google Patents
Energy-saving circulating system of freeze dryer Download PDFInfo
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- CN214746788U CN214746788U CN202121271558.5U CN202121271558U CN214746788U CN 214746788 U CN214746788 U CN 214746788U CN 202121271558 U CN202121271558 U CN 202121271558U CN 214746788 U CN214746788 U CN 214746788U
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Abstract
An energy-saving circulating system of a freeze dryer belongs to the technical field of freeze dryer circulating systems and comprises a box body, a cold trap system and a heating system, wherein the cold trap system comprises a cold trap coil, a first heat exchanger and a refrigerating system, and the cold trap coil exchanges heat with the refrigerating system through the first heat exchanger; the temperature rising system is connected with a second heat exchanger, the second heat exchanger is further connected between the first heat exchanger and the inlet of the cold trap coil, the two ends of the second heat exchanger are further connected through short wires, and the short wires are connected with the inlets of the first heat exchanger and the cold trap coil. The utility model discloses utilize intensification system, cold-trap system and heat accumulation system, make full use of is rich in surplus heat and cold volume, makes the freeze dryer refrigerate rapidly, heats or store the heat through the stop valve switching, improves the availability factor, increases freeze-drying case function.
Description
Technical Field
An energy-saving circulating system of a freeze dryer belongs to the technical field of freeze dryer circulating systems.
Background
The freeze dryer is a device for rapidly drying food or articles by vacuum, high temperature and freezing, and a container for production mainly comprises a freeze drying box and a cold trap. The freeze-drying box mainly comprises a box body container and a heat exchange shelf, and is used for ensuring the temperature and the vacuum degree of food and controlling the evaporation of moisture, the cold trap is mainly used for trapping moisture, and the cold trap are usually assembled together.
In the prior art, a freeze-drying box water circulation system and a cold trap refrigeration circulation system are two mutually independent systems. Circulating water in a shelf of a heat conduction box in the freeze-drying box is heated by an electric heater to promote the evaporation of water in food; several groups of coiled coils are installed in the cold trap, the throttled refrigerant is cooled in the coiled coils to condense the water vapor volatilized from the food, and the vapor is condensed into frost attached to the surfaces of the coiled coils.
The main problems in the prior art are that (1) the temperature of water in the heat-conducting shelf is continuously heated completely by electric energy, and the energy consumption is high; (2) the cold trap is internally provided with a plurality of groups of coil pipes, the refrigerant is distributed to each group of coil pipes by a liquid distributor, the flow distribution of the refrigerant in each group of coil pipes is usually uneven because the throttled refrigerant is in a gas-liquid two-phase state or because of the change of the flow, most commonly, the pressure of the gas-phase refrigerant is higher, the pressure in the coil pipes is higher, the refrigerant cannot flow normally, the phenomenon that the temperature of the plurality of groups of coil pipes is not reduced occurs, and the ice catching speed and the ice catching capacity of the cold trap are seriously influenced; (3) after production is finished, frost on the surface of the coil pipe can be removed only by natural temperature rise or water flushing, and the problems of low defrosting speed or waste of a large amount of purified water occur; (4) the temperature of the produced food is generally higher, the food needs to be cooled by means of natural cooling or cooling water heat exchange cooling, and the problem of slow cooling or water waste can also occur.
Disclosure of Invention
The utility model discloses the technical problem that will solve is: the defects of the prior art are overcome, and the energy-saving circulating system of the freeze dryer, which has the advantages of low energy consumption, rapid temperature rise or temperature reduction, high freeze-drying efficiency and automatic defrosting function, is provided.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a freeze dryer energy-saving circulation system, includes box, cold trap system and intensification system, its characterized in that: the cold trap system comprises a cold trap coil, a first heat exchanger and a refrigerating system, wherein the cold trap coil exchanges heat with the refrigerating system through the first heat exchanger;
the temperature rising system is connected with a second heat exchanger, the second heat exchanger is further connected between the first heat exchanger and the inlet of the cold trap coil, the two ends of the second heat exchanger are further connected through short wires, and the short wires are connected with the inlets of the first heat exchanger and the cold trap coil.
The cold trap system is independently split into the cold trap coil and the refrigerating system, the heat conducting oil is used as a refrigerating medium in the cold trap coil, the refrigerating system using the refrigerating medium is independently used as a cold source, the problem that the pressure in the coil is too high and cannot circulate after the refrigerating medium absorbs heat in the cold trap coil and evaporates into gas is solved, the heat conducting oil in the cold trap coil is stable in circulation, and the refrigerating effect is stable.
Meanwhile, by utilizing the stability of heat conduction oil and the dual performance of heat conduction and cold conduction and matching with the second heat exchanger, the second heat exchanger does not participate in circulation in the cooling stage of the cold trap system or the heating stage of the heating system, only circulating water in the heating system flows through the second heat exchanger, and oil in the heat conduction plate layer does not circulate in the second heat exchanger but circulates through a short-circuit wire; after the refrigeration of cold-trap coil pipe is accomplished, when needing to remove the surface frost, make the conduction oil in the cold-trap coil pipe circulate through the second heat exchanger, the heat transfer oil accepts the heat that comes from the intensification system circulating water, carries the heat and gets into the cold-trap coil pipe, can be quick to the frost heating on cold-trap coil pipe surface melt, make full use of intensification system's waste heat provides new defrosting function for freeze-drying case system.
Preferably, the cold trap system comprises a compressor, a first condenser, a second condenser and an expansion valve, wherein a pipeline at the outlet of the compressor is sequentially connected with the first condenser, the second condenser and the expansion valve, and is communicated with the inlet of the compressor after passing through the first heat exchanger.
The compressor is started, high-temperature refrigerant steam is changed into low-temperature high-pressure refrigerant liquid through the first condenser, the refrigerant is changed into low-temperature low-pressure gas through the expansion valve, heat exchange is carried out between the low-temperature low-pressure gas and heat conduction oil in the cold trap coil pipe through the first heat exchanger, and the low-temperature low-pressure gas returns to the compressor after heat of the heat conduction oil is absorbed to complete circulation.
Preferably, the first condenser is connected with a temperature raising system.
Preferably, the temperature raising system comprises a heat conducting plate layer and a water heater; the outlet of the water heater is connected with the inlet of the heat conducting plate layer after being connected with the tube side or the shell side of the second heat exchanger, the outlet of the heat conducting plate layer is communicated with the inlet of the water heater, and the first condenser is connected with the water heater in parallel.
In the heating stage of the heating system, one path of water flowing out of the heat conducting plate layer is heated by the water heater, the other path of water flows to the first condenser and is heated by the high-temperature refrigerant of the cold trap system, and finally two paths of circulating water are collected and then enter the heat conducting plate layer to heat the interior of the freeze-drying box.
The refrigerant of the refrigeration system is fully utilized to carry heat, the temperature of circulating water of the heating system is increased, the heating efficiency of the heating system is increased, and energy-saving and efficient production is synchronously realized.
Preferably, the water heater further comprises a heat storage tank, the heat storage tank is connected to two ends of the water heater in parallel, and inlet and outlet pipelines of the heat storage tank are in short circuit through short-circuit wires.
After the heat conduction plate layer reaches required temperature, at first close the water heater, make the circulating water in time lose the heat source, make the circulating water flow to heat accumulation jar direction, accessible short-circuit line makes earlier that to have thermal circulating water to flow and gets into first condenser and accept the heat from refrigerating system refrigerant steam, receives to get into heat accumulation jar storage heat through the water route three-way valve after the heating, can in time empty the intraformational hot water of heat-conducting plate simultaneously, avoids freeze-drying incasement overtemperature. When heat conduction plate layer temperature is lower, evacuation heat accumulation jar, storage hot water directly carry the heat to get into the circulation pipeline again, get into freeze-drying case intensification stage, because the water when beginning to circulate is high temperature promptly, consequently can be immediately to the heating of freeze-drying incasement heat conduction plate layer, improve heating response speed, improve production efficiency.
Preferably, the outlet pipeline of the heat conducting plate layer is further connected with a third heat exchanger, and the third heat exchanger is externally connected with a heat source.
In the stage of defrosting the cold trap coil after the work is finished, an external heat source is used for intervention, so that the temperature of circulating water in a heating system can be increased, and the defrosting efficiency is improved; for the heating stage of the heating system, the external heat source can improve the heating efficiency.
Preferably, the second stop valve is also connected in parallel with a temperature control valve, and the temperature control valve is connected with the first condenser through a circuit and a temperature probe.
In the heat storage stage, after the water heater is closed, the temperature control valve and the temperature probe are inserted into the heat storage system, when the temperature of the shell pass part of the first condenser is too high, the temperature control valve is opened, hot water is injected into the heat storage tank, when the actual heating temperature in the first condenser is insufficient, the temperature control valve is closed, circulating water cannot enter the first condenser to be connected with the heat storage tank to receive heat, and cannot enter the heat storage tank to avoid cold water being stored in the heat storage tank.
Preferably, a circulating water expansion tank is arranged between the outlets of the heat-conducting plate layers.
Under the condition that the temperature of the circulating water is higher, due to the expansion of the heated volume, redundant water cannot be discharged into the heat storage tank in the temperature rise stage of the freeze-drying tank, the water with redundant pressure can be stored in the circulating water expansion tank, and the pressure of a circulating water pipeline is buffered.
Preferably, a heat conducting oil expansion tank is arranged on a pipeline between the outlet of the cold trap coil and the first heat exchanger.
The excessive expansion and contraction volume of the heat conduction oil and the excessive pressure in the cold trap coil are avoided, and the heat conduction oil expansion tank is used for storing the expanded redundant volume of heat conduction oil to relieve the pressure.
Preferably, the outlet of the second heat exchanger is further provided with a one-way valve, so that the flow direction in the pipeline is away from the cold trap coil.
And the heat conducting oil in the cold trap cooling stage is prevented from entering the tube pass part of the second heat exchanger to exchange heat with circulating water.
Compared with the prior art, the utility model discloses the beneficial effect who has is: the cold trap system is divided into a cooling pipeline and a circulating pipeline, and the circulating pipeline is responsible for cooling the coil pipes in the box body, so that the internal heat-conducting medium can be replaced by heat-conducting oil, the cold trap coil pipes are prevented from being blocked by pressure caused by evaporation of a refrigerating medium, all the cold trap coil pipes are fully utilized, and the refrigerating efficiency is improved; the cold trap system and the heating system are mutually interfered, the surplus heat (cold) is fully utilized, and the energy consumption is saved; the heat storage system realizes quick response of temperature rise and temperature reduction of the temperature rise system, and can recover and store redundant heat, thereby further reducing energy consumption; the heating system has the function of rapid cooling, and the using efficiency of the freeze-drying box is improved.
Drawings
Fig. 1 is a schematic diagram of an energy-saving circulation system of a freeze dryer.
The system comprises a compressor 1, a first condenser 2, an expansion valve 3, a first heat exchanger 4, a cold trap coil 5, a box 6, a water heater 7, a second heat exchanger 8, a heat conducting plate layer 9, an oil way three-way valve 10, a heat storage tank 11, a first stop valve 12, a water way three-way valve 13, a second stop valve 14, a third stop valve 15, a fourth stop valve 16, a water circulating pump 17, a circulating water expansion tank 18, a heat conducting oil expansion tank 19, a temperature control valve 20, a second condenser 21 and a third heat exchanger 22.
Detailed Description
The present invention will be further explained with reference to fig. 1.
Referring to figure 1: the utility model provides a freeze dryer energy-saving circulation system, includes box 6, cold-trap system, intensification system and heat accumulation system, its characterized in that: the cold trap system comprises a compressor 1, a first condenser 2, a second condenser 21, an expansion valve 3, a first heat exchanger 4, a cold trap coil pipe 5, a heat-conducting oil circulating pump and a heat-conducting oil expansion tank 19; the compressor 1 is communicated with the second condenser 21 and the expansion valve 3 after being communicated with the shell pass of the first condenser 2, and is communicated with the return compressor 1 after passing through the first heat exchanger 4, the cold trap coil 5 is arranged in the box body, the outlet of the cold trap coil 5 is communicated with the heat-conducting oil expansion tank 19, the heat-conducting oil circulating pump and the first heat exchanger 4 in sequence and then is communicated with the inlet of the cold trap coil 5, and the second condenser 21 is externally connected with a cold source.
The temperature rising system comprises a water heater 7, a water circulating pump 17, a water expansion tank 19, a second heat exchanger 8, a third heat exchanger 22 and a heat conducting plate layer 9; the heat conducting plate layer 9 is arranged in the box body 6, after the water heater 7 is communicated with the shell side of the second heat exchanger 8, the outlet of the shell side is communicated with the heat conducting plate layer 9, the outlet of the heat conducting plate layer 9 is communicated with the water expansion tank 19 and the water circulating pump 17, then is communicated with the water heater 7 through the third heat exchanger 22, and the front end of the water heater 7 is provided with a switch valve; the tube pass inlet and outlet of the second heat exchanger 8 are communicated with a tube pass between the inlet of the cold trap coil 5 and the first heat exchanger 4, wherein a pipeline connected with the tube pass inlet of the second heat exchanger 8 is connected with a pipeline between the inlet of the cold trap coil 5 and the first heat exchanger 4 through an oil way three-way valve 10, so that heat conduction oil in the cold trap coil 5 can enter the tube pass part of the second heat exchanger 8 under the control of the oil way three-way valve 10, and meanwhile, a one-way valve is arranged on the pipeline connected with the tube pass outlet of the second heat exchanger 8, so that the heat conduction oil can not flow backwards to enter the tube pass of the second heat exchanger 8 when the heat conduction oil does not pass through the tube pass part of the second heat exchanger 8 by the oil way three-way valve 10; the third heat exchanger 22 is externally connected to a heat source.
The heat storage system comprises a tube side part of the first condenser 2, a heat storage tank 11, a first stop valve 12, a second stop valve 14, a temperature control valve 20 and a waterway three-way valve 13, wherein one end of the tube side of the first condenser 2 is communicated with the waterway three-way valve 13, the heat storage tank 11, the first stop valve 12 and the second stop valve 14 in sequence and then communicated to the other end, a pipeline between the first stop valve 12 and the second stop valve 14 is communicated to the water inlet end of the water heater 7, and a third stop valve 15 is arranged on the pipeline for connection; the waterway three-way valve 13 is communicated to the water outlet end of the water heater 7, and a fourth stop valve 16 is arranged on a pipeline for connection; the pipeline between the water storage tank 11 and the first stop valve 12 is communicated with the pipeline from the waterway three-way valve 13 to the water heater 7, the temperature control valve 20 is connected in parallel at two ends of the second stop valve 14, and the temperature control valve 20 is connected with the shell pass of the first condenser 2 through a circuit and a temperature probe.
The cold trap coil 5 and the heat conducting plate layer 9 are respectively arranged at two ends of the box body 6; a main on-off valve is also provided on the line between the second condenser 21 and the first heat exchanger 4.
The operation of the freeze dryer is divided into the following stages:
and (3) cooling the cold trap: the direction from the first heat exchanger 4 to the cold trap coil pipe 5 is opened by the oil way three-way valve 10, the compressor 1 is started, high-temperature refrigerant steam is changed into low-temperature high-pressure refrigerant liquid through the first condenser 2, the refrigerant is changed into low-temperature low-pressure gas through the expansion valve 3, heat is exchanged with heat conduction oil in the cold trap coil pipe 5 through the first heat exchanger 4, and the heat of the heat conduction oil is absorbed and then returned to the compressor to complete circulation.
And (3) a freeze-drying box temperature rise stage: the second stop valve 14 and the third stop valve 15 are opened, the first stop valve 12 is closed, and the waterway three-way valve 13 opens the direction of the first condenser 2 leading to the second heat exchanger 8; at the moment, one path of circulating water is heated by the water heater 7, the other path of circulating water flows through the first condenser 2 and is heated by a high-temperature refrigerant of the cold trap system, and finally, the two paths of circulating water converge and flow through the shell pass of the second heat exchanger 4 and then enter the heat conducting plate layer 9 to heat the interior of the freeze-drying box body 6.
A heat storage stage: after the heat conducting plate layer 9 reaches the required temperature, firstly the water heater 7 is closed, the second stop valve is closed, the circulating water loses the heat source in time, the first condenser 2 is opened by the waterway three-way valve 13 to lead to the direction of the heat storage tank 11, the second stop valve 14 is opened, the circulating water continuously flows to enter the pipe pass of the first condenser 2, and the circulating water enters the heat storage tank 11 through the waterway three-way valve 13 after being heated to store heat. When heat conduction plate layer 9 temperature is lower, open first stop valve 12 and empty heat accumulation jar 11, store hot water and directly carry the heat and get into the circulation pipeline again, close first stop valve 12, water route three-way valve 13 opens the direction that first condenser 2 accesss to second heat exchanger 8, get into freeze-drying case intensification stage, owing to the water when beginning the circulation is high temperature promptly, consequently can be immediately to the heating of freeze-drying incasement heat conduction plate layer 9, improve heating response speed.
After the water heater 7 and the second stop valve 14 are closed, the temperature control valve 20 and the temperature probe are inserted into the heat storage system, when the temperature of the shell side part of the first condenser 2 is too high, the opening of the temperature control valve 20 is increased, circulating water can enter the first condenser 2 to receive heat, and the finished hot water is injected into the heat storage tank 11, when the actual heating temperature in the first condenser 2 is not enough, the opening of the temperature control valve is reduced, the circulating water cannot enter the first condenser 2 to receive heat, and cannot enter the heat storage tank 11, so that the temperature of the hot water entering the heat storage tank 11 is always kept at a high temperature.
And (3) defrosting stage: opening the direction from the first heat exchanger 4 to the second heat exchanger 8 of the oil way three-way valve 10, stopping the cold trap system, stopping heat exchange in the first heat exchanger 4, enabling heat conducting oil in the cold trap coil 5 to pass through the first heat exchanger 4 and then enter the second heat exchanger 8 through the oil way three-way valve 10, enabling hot water from a heating system to be arranged in the shell pass of the second heat exchanger 8 at the moment, enabling the heat conducting oil to be heated from the second heat exchanger 8 and then flow back to the cold trap coil 5, heating the cold trap coil 5, and melting frost on the surface of the cold trap coil 5; at the moment, the third stop valve 15 of the heat storage system is opened, the first stop valve 12 is closed, the second stop valve 14 is opened, the waterway three-way valve 13 opens the first condenser 2 to the direction of the heat storage tank 11 and enters the hot water of the shell pass of the second heat exchanger 8, one path of the hot water comes from the hot water heated by the water heater 7, the other path of the hot water comes from the hot water stored in the heat storage tank 11, and the two paths of the hot water are converged and then enter the shell pass of the second heat exchanger 8 to heat the tube pass heat conduction oil for heating and warming. When the circulating water temperature is not enough, the third heat exchanger 22 can be externally connected with a heat source to intervene, so that the circulating water temperature is increased, and the defrosting effect is improved.
On the contrary, if the water heater 7 is turned off in the defrosting stage, the temperature of the articles in the box body 6 contacting the heat conducting plate layer 9 can be rapidly reduced by equivalently utilizing the heat conducting oil in the cold trap coil 5 and reducing the temperature of the circulating water in the heat conducting plate layer 9 through the second heat exchanger 8, so that the energy-saving circulating system of the freeze dryer has the functions of rapidly increasing and reducing the temperature.
The heat conduction oil expansion tank 19 and the circulating water expansion tank 18 are respectively used for pressure buffering when heat conduction oil or circulating water expands under heating.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a freeze dryer energy-saving circulation system, includes box (6), cold trap system and intensification system, its characterized in that: the cold trap system comprises a cold trap coil (5), a first heat exchanger (4) and a refrigerating system, wherein the cold trap coil (5) exchanges heat with the refrigerating system through the first heat exchanger (4);
the temperature rising system is connected with a second heat exchanger (8), the second heat exchanger (8) is further connected between the first heat exchanger (4) and the inlet of the cold trap coil pipe (5), two ends of the second heat exchanger (8) are further connected through short wires, and the short wires are connected with the inlet of the first heat exchanger (4) and the inlet of the cold trap coil pipe (5).
2. The energy-saving circulation system of the freeze dryer as claimed in claim 1, wherein: the cold trap system comprises a compressor (1), a first condenser (2), a second condenser (21) and an expansion valve (3), wherein a pipeline at the outlet of the compressor (1) is sequentially connected with the first condenser (2), the second condenser (21) and the expansion valve (3), and is communicated with the inlet of the compressor (1) after passing through a first heat exchanger (4).
3. The energy-saving circulation system of a freeze dryer according to claim 2, wherein: the first condenser (2) is connected with a temperature rising system.
4. The energy-saving circulation system of a freeze dryer according to claim 3, wherein: the temperature rising system comprises a heat conducting plate layer (9) and a water heater (7); the outlet of the water heater (7) is connected with the inlet of a heat-conducting plate layer (9) after being connected with the tube side or the shell side of the second heat exchanger (8), the outlet of the heat-conducting plate layer (9) is communicated with the inlet of the water heater (7), and the first condenser (2) is connected with the water heater (7) in parallel.
5. The energy-saving circulation system of a freeze dryer according to claim 4, wherein: still include heat accumulation jar (11), heat accumulation jar (11) are parallelly connected at water heater (7) both ends to heat accumulation jar (11) access & exit pipeline passes through the short circuit of short circuit.
6. The energy-saving circulation system of a freeze dryer according to claim 4, wherein: and an outlet pipeline of the heat-conducting plate layer (9) is also connected with a third heat exchanger (22), and the third heat exchanger (22) is externally connected with a heat source.
7. The energy-saving circulation system of a freeze dryer according to claim 4, wherein: the inlet of the first condenser (2) is connected with a pipeline of the heating system, a temperature control valve (20) is arranged on the pipeline, and the temperature control valve (20) is connected with a temperature probe through a circuit to form a shell pass of the first condenser (2).
8. The energy-saving circulation system of a freeze dryer according to claim 4, wherein: and a circulating water expansion tank (18) is arranged at the outlet of the heat-conducting plate layer (9).
9. The energy-saving circulation system of the freeze dryer as claimed in claim 1, wherein: and a heat conducting oil expansion tank (19) is arranged on a pipeline between the outlet of the cold trap coil (5) and the first heat exchanger (4).
10. The energy-saving circulation system of the freeze dryer as claimed in claim 1, wherein: and a one-way valve is further arranged at the outlet of the second heat exchanger (8), so that the flow direction in the pipeline is far away from the cold trap coil (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121271558.5U CN214746788U (en) | 2021-06-08 | 2021-06-08 | Energy-saving circulating system of freeze dryer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121271558.5U CN214746788U (en) | 2021-06-08 | 2021-06-08 | Energy-saving circulating system of freeze dryer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115253985A (en) * | 2022-08-31 | 2022-11-01 | 万华化学集团股份有限公司 | Heat transfer system for intermittent reaction and control method |
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2021
- 2021-06-08 CN CN202121271558.5U patent/CN214746788U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115253985A (en) * | 2022-08-31 | 2022-11-01 | 万华化学集团股份有限公司 | Heat transfer system for intermittent reaction and control method |
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